Vanes for rotary pumps and the like



vD66- 1957 A. HERSCHEL 2,818,024

VANES FOR ROTARY PUMPS AND THE LIKE Filed March 12, 1953 [Cfi 3O I Fl A FIG. -1- Fl [1 g2 1* 2 5 21,12 25 2p v 2a W% 22 jaxxgf Fill-E 39 27 ap,2a 25 l INVENTOR. 29 ALF HERSCHEL ATTORNEY United States Patent VANES-FOR ROTARY P-UMPS AND THE LIKE Alf-Herschel, Wynnewood, Pa. ApplicationMarch12,1953, Serial No. 341,933 sfi a m rqnae-.136)

This invention relates to vanes for rotary pumps and the like.

It has heretofore been proposed to provide in sliding vane type pumps and the like, vanes which will reduce the wear on the rotor chamber surfaces with which the vanes engage in the rotation of the rotor. The vanes heretofore proposed have not, however, proven wholly satisfactory.

It is the principal object of the present invention to provide an improved vane for rotary pumps and the like with which wear on the pump cylinder liners and rotor grooves will be greatly reduced.

It is a further object of the present invention to pro vide a unitary vane for rotary pumps and the like in which the parts are so constructed and assembled as to obviate the separation of the parts because of vibration or other causes.

It is a further object of the present invention to provide a vane for rotary pumps and the like of a material with which the friction upon contact with the pump cylinder liner and rotor grooves will be reduced while, at the same time, by the use of added Weight an improved character of operation will be effected.

It is a further object of the present invention to provide a vane for rotary pumps and the like which has increased weight.

It is a further object of the present invention to provide, in vanes for rotary pumps and the like, an improved character of Weighting with inserted metal.

Other objects and advantageous features of the invention will be apparent from the specification and claims.

The nature and characteristic features of the present invention will be more readily understood from the following description, taken in connection with the accompanying drawings forming part hereof, in which:

Figure l is a central transverse sectional view of a rotary pump or the like having vanes in accordance with the invention mounted therein;

Fig. 2 is a view partly in elevation and partly in section of one of the vanes removed from the pump of Fig. 1;

Fig. 3 is a sectional view taken approximately on the line 3-3 of Fig. 2;

Fig. 4 is a view partly in elevation and partly in section showing another vane in accordance with the invention;

Fig. 5 is a sectional view taken approximately on the line 55 of Fig. 4;

Fig. 6 is a view partly in elevation and partly in section showing another vane in accordance with the invention; and

Fig. 7 is a sectional view taken approximately on the line 7-7 of Fig. 6.

It should, of course, be understood that the description and drawings herein are illustrative merely, and that various modifications and changes may be made in the structure disclosed without departing from the spirit of the invention.

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R ferr .aqw alp epa t cularlvto 1 of the draw- .igg a new Pi up i illu rated. fo pu o of planationhzivihg ,a housingllt), with an inlet connection f. ipnlzs pt r mmun wi h a r o qh mh r .13, in the nteri n f a yli e li e the chamber ;13, an eccentrically mounted y e d mg, shaft 16, the rotor 15 havstat r .15 @9114? ing a plurality of radial slots 17 for the receptionofslidins va es 10 14 .9 o the pre en inv n n b in r ticularly suitable.

Referring now more particularly to Figs. 2 and 3 of the drawings, the vane 20 there shown has a pair of parallel end faces 21 and 22, parallel inner and outer faces 23 and 24 normal to the end faces 21 and 22, and parallel side faces 25 and 26, normal to the end faces 21 and 22 and to the faces 23 and 24.

The body of the vane 20 may be of any suitable material, the preferred material for use with bronze or brass cylinder liners 14 being a phenolic resinoid, or canvas impregnated with phenolic resinoid, so as to be of high mechanical strength and small tendency to water absorption.

The vane 20, within the central or mid-portion thereof, is provided with a plurality of intersecting but non-continuous or offset bores 27 and 28, between the end faces 21 and 22, and small bores 29, intersecting the bores 27 and 28 and extending inwardly from one of the side faces 25 but preferably terminating short of the other side face 26.

Within the spaces provided in the interior of the body of the vane 20 by the bores 27, 28 and 29, metallic inserts 30 are provided, preferably by casting the metal in place, the bores 29 serving if desired as vent openings during the casting operation and also being filled with metal.

While any desired non-ferrous metal may be used, it is preferred to use white metal composed of approximately lead and 20% tin, as this is softer than the material of the cylinder liner 14 and accordingly reduces the tendency to injure the same.

The offsetting of the bores 27 and 28 and the provision of the cross bores 29 aid in locking the inserts 30 in place and prevent dislodgement thereof by vibration, while at the same time obviating the necessity for using separate rivets.

The vane 20, because of its construction, does not have any directional characteristics insofar as initial insertion in the slots 17 is concerned. If it becomes worn at one face, such as the face 24, it may be turned so that the face 23 is substituted. If the vane 20 should wear to an extent to expose the metal insert 30 to contact with the cylinder liner 14, no damage to the liner 14 will result because of the relatively soft character of the metal insert 30. The locating of the metal insert 30 at the central or mid-portion of the vane 20 permits greater wear from either spaced face 23 or 24 before the metal is exposed.

Referring now more particularly to Figs. 4 and 5 of the drawings, the vane 20a there shown is generally similar to the vane 20 but is provided, at the central or midportion thereof, with a pair of parallel through bores 27:: and 28a, connected at their ends by bridge grooves 31, the interior spaces thus provided being filled, as before, with a metal insert 30a.

Referring now more particularly to Figs. 6 and 7 of the drawings, the vane 20b there shown is generally similar to the vane 20 but is provided, at the central or midportion thereof, with a central through bore 27b, and a plurality of transverse intersecting bores 29b, the interior space of the bore 27b thus provided being filled, as before, with a metal insert 30b, and the cross bores 29b having cast or other pins 29' inserted therein.

It will be noted that the vanes 20a and 20b have the same characteristics of insertability andreversibility as the vane 20. o

I claim: q I

1. A vane for pumps and the like comprising a nonmetallic body having spaced parallel endfaces, spaced parallel side faces normal to said end faces, and inner and outer parallel faces, said body intermediate said inner and outer faces being provided with an opening extending from one end face to the other end face, said opening between its ends having offset portions therein, and a metal insert filling said opening and held against displacement by engagement in said opening with said ofiset portions.

2. A vane as defined in claim 1 in which the opening includes a plurality of bores.

3. A vane as defined in claim 1 in which the opening includes a pair of intersecting bores meeting in oifset relation.

4. A vane as defined in claim 1 in which the opening has enlarged ends.

5. A vane as defined in claim 1 in which the metal insert is of white metal.

References Cited in the file of this patent UNITED STATES PATENTS 1,192,978 Belyea Aug. 1, 1916 2,468,734 Brant May 3, 1949 FOREIGN PATENTS 561,635 France Aug. 13, 1923 

